If you want something to work on a single 9volt supply (as I assume you have for your APC) the most common response would probably be to lift the filter section from the MFOS Weird Sound Generator. Eric Archer's website has a schematic for a more robust filter on a single supply based on the lm13700 dula OTA. You can also build a nifty one op-amp Sallen-Key filter with a single supply. Another possible option would be a state-variable filter based on a cd4069 cmos chip. If you dig around a little on this site, especially in the Lunetta sub-forum, there are some great threads on simple, low-parts, resonant filters that you could adapt and use. Feel free to reply if you need more information. Good luck, and I hope this helps.

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